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                [Wf2014]baggage                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p>&nbsp;给定一排长度为4n的格子，编号从-2n+1到2n</p>
<div>每个编号为正的格子中有一个物品，其中每个编号为奇数的格子中有一个B类物品，编号为偶数的格子中有一个A类物品</div>
<div>例如：当n=4时初始状态如下图所示：</div>
<div><img src="../file/4072_0.png" width="960" height="100" alt="" /></div>
<div>你只能进行一种操作：选择某两个相邻的格子，要求这两个格子中都有物品，然后移动到另外两个相邻的空格子中，不能改变两个格子的相对位置</div>
<div>要求进行最少的操作使得所有物品以AAA...ABBB...B(n个A和n个B)的形式排列在一起</div>
<div></div></p><hr/><h3>输入格式</h3><p><p>输入数据包含一行一个正整数n，含义如题面中所示</p>
<div></div></p><hr/><h3>输出格式</h3><p><p>输出一个最短的满足要求的移动序列</p>
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<div>每个操作的格式如下：</div>
<div>x to y</div>
<div>含义为将x和x+1两个格子中的物品移动到y和y+1两个位置</div>
<div>如果有多组方案可以达到要求，你可以输出任意一组。</div>
</div></p><hr/><h3>样例输入</h3><pre>5</pre><hr/><h3>样例输出</h3><pre>8 to -1
3 to 8
6 to 3
0 to 6
9 to 0
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>鸣谢wangtianyi1998提供SPJ及题面</p>
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